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If the dryer hums for 5 seconds and cuts off, that means the motor isn't turning over and it's overheating and cutting out. Try to open the door and manually turn the drum by hand just to make sure nothing is jamming the drum. Turn the dryer on again and try again. If it still just hums and cuts out after 5 seconds, you'll need to take the dryer apart and make sure the belt is connected. If so, then your motor has overworked itself and failed I'm sorry to say so you'll need to replace the motor below the drum.
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